I put together this little spreadsheet for some background research yesterday. It shows which candidates have the most Twitter followers, when they joined, when they sent their first tweet and how often they tweet.

An interesting discovery: Tim Pawlenty doesn't seem to understand what happens when you start a tweet with an @mention. Unless he's trying to have a conversation with Conan O'Brien (or one that only people who follow both accounts can see), this joke failed: http://twitter.com/#!/timpawlenty/status/90492604797550593